The method that AutoREALM uses to create non-solid line styles is based on pixels. The size of the line style features remain the same, regardless of the zoom level. That means that zooming in or out may change the positioning of the symbols on the line. To alleviate this effect, you can either make line endpoints that hide the discontinuity, make the lines end within solid structures, or try to use a single continuous polyline instead of multiple single lines.